<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>列表排序</title>
    <script src="../js/vue.js"></script>
</head>

<body>
    <div id="app">
        <h1>列表排序</h1>
        <input type="text" placeholder="请输入名字" v-model="keyWord">
        <button data-id="2" @click="handlerSort">升序</button>
        <button data-id="1" @click="handlerSort">降序</button>
        <button data-id="0" @click="handlerSort">原顺序</button>
        <ul>
            <li v-for="(p,index) in filPersons" :key="p.id"> {{p.name}}-{{p.age}} </li>
        </ul>
    </div>
    <script>
        Vue.config.productionTip = false
        const vm = new Vue({
            data() {
                return {
                    sortType: 0,//0:原顺序 1:降序 2:升序
                    keyWord: '',
                    persons: [
                        { id: '001', name: '周冬雨', age: 18 },
                        { id: '002', name: '马冬梅', age: 21 },
                        { id: '003', name: '周杰伦', age: 20 },
                        { id: '004', name: '温兆伦', age: 19 }
                    ]
                }
            },
            methods: {
                handlerSort(e) {
                    this.sortType = Number(e.target.dataset.id)
                }
            },
            computed: {
                filPersons() {
                    const arr = this.persons.filter((p) => {
                        return p.name.indexOf(this.keyWord) !== -1
                    })
                    if (this.sortType) {
                        arr.sort((p1, p2) => {
                            return this.sortType === 1 ? p2.age - p1.age : p1.age - p2.age;
                        })
                    }
                    return arr;
                }
            }

        })

        vm.$mount('#app')
    </script>
</body>

</html>